In a common-emitter transistor amplifier, the audio signal voltage across the collector is 3 V. The resistance of the collector is 3 k$\Omega$. If the current gain is 100 and the base resistance is 2 k$\Omega$, the voltage and power gain of the amplifier are:

1. 200 and 1000

2. 15 and 200

3. 150 and 15000

4. 20 and 2000

Subtopic:  Applications of Transistor (OLD NCERT) |
77%
From NCERT
NEET - 2017
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An n-p-n transistor is connected in the common base configuration in a given amplifier. A load resistance of 800Ω is connected in the collector circuit and the voltage drop across it is 0.8 V. If the current amplification factor is 0.96 and the input resistance of the circuits is 192 Ω the voltage gain and the power gain of the amplifier will respectively be

1. 3.69,3.84
2. 4,4
3. 4,3.69
4. 4,3.84

Subtopic:  Applications of Transistor (OLD NCERT) |
63%
From NCERT
NEET - 2016
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Transfer characteristic [output voltage $\left({V}_{o}\right)$ vs input voltage $\left({V}_{i}\right)$] for a base biased transistor in CE configuration is as shown in the figure. For using transistor as a switch, it is used:

1. in region III

2. both in region (I) and (III)

3. in region II

4. in region I

Subtopic:  Applications of Transistor (OLD NCERT) |
77%
From NCERT
NEET - 2012
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For transistor action:

 (a) the base, emitter and collector regions should have similar size and doping concentrations. (b) the base regions must be very thin and lightly doped. (c) the emitter-base junction is forward biased and the base-collector junction is reverse biased. (d) both the emitter-base junction as well as the base-collector junction are forward biased.

Which of the following pairs of statements is correct?
1. (d) and (a)
2. (a) and (b)
3. (b) and (c)
4. (c) and (d)

Subtopic:  Transistor (OLD NCERT) |
86%
From NCERT
NEET - 2010
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The emitter-base junction of a transistor is …… biased while the collector-base junction is ……. biased.
1. reverse, forward

2. reverse, reverse

3. forward, forward

4. forward, reverse

Subtopic:  Transistor (OLD NCERT) |
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For a transistor, the current amplification factor is 0.8 when it is connected in the common base configuration. The transistor is now connected in common emitter configuration. The change in the collector current when the base current changes by 6 mA, is:
1. 6 mA

2. 4.8 mA

3. 24 mA

4. 8 mA

Subtopic:  Applications of Transistor (OLD NCERT) |
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Consider an NPN transistor amplifier in the common-emitter configuration. The current gain of the transistor is 100. If the collector current changes by 1 mA, what will be the change in emitter current?
1. 1.1 mA

2. 1.01 mA

3. 0.01 mA

4. 10 mA

Subtopic:  Transistor (OLD NCERT) |
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For the transistor circuit shown below, if $\mathrm{\beta }$ = 100, the voltage drop between emitter and base is 0.7 V, then the value of ${\mathrm{V}}_{\mathrm{CE}}$ will be:

1. 10 V
2. 5 V
3. 13 V
4. 0 V

Subtopic:  Applications of Transistor (OLD NCERT) |
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In the circuit shown in the figure, the input voltage Vi is 20 V, VBE = 0, and VCE = 0. The values of IB, Iand $\beta$ are given by:

1. ${\mathrm{I}}_{\mathrm{B}}$ $=$ $40$ $\mathrm{\mu A},$ ${\mathrm{I}}_{\mathrm{c}}$ $=$ $10$ $\mathrm{mA},$ $\mathrm{\beta }$ $=$ $250$

2. ${\mathrm{I}}_{\mathrm{B}}$ $=$ $25$ $\mathrm{\mu A},$ ${\mathrm{I}}_{\mathrm{c}}$ $=$ $5$ $\mathrm{mA},$ $\mathrm{\beta }$ $=$ $200$

3. ${\mathrm{I}}_{\mathrm{B}}$ $=$ $20$ $\mathrm{\mu A},$ ${\mathrm{I}}_{\mathrm{c}}$ $=$ $5$ $\mathrm{mA},$ $\mathrm{\beta }$ $=$ $250$

4. ${\mathrm{I}}_{\mathrm{B}}$ $=$ $40$ $\mathrm{\mu A},$ ${\mathrm{I}}_{\mathrm{c}}$ $=$ $5$ $\mathrm{mA},$ $\mathrm{\beta }$ $=$ $125$

Subtopic:  Applications of Transistor (OLD NCERT) |
70%
From NCERT
NEET - 2018
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In a common-emitter transistor amplifier, the audio signal voltage across the collector is 3V. The resistance of the collector is 3k$\Omega$. If the current gain is 100 and the base resistance is 2k$\Omega$, the voltage and power gain of the amplifier are:

1. 15 and 200

2. 150 and 15000

3. 20 and 2000

4. 200 and 1000

Subtopic:  Applications of Transistor (OLD NCERT) |
70%
From NCERT
NEET - 2017
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